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Home >> Lexus >> 2015 >> RX 350 Base, FWD >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System - Diagnostic Codes & Circuit Tests >> Pre-Collision System >> DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0140: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Airbag ECU; DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [03/2014 - ] >> Description
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DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0140: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Airbag ECU; DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [03/2014 - ]: Description

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

DTC No. DTC Detection Condition Trouble Area
U0122
  • When the engine switch is on (IG), a communication error between the skid control ECU and the driving support ECU is detected for approximately 8 seconds.
  • When the engine switch is on (IG), a communication error between the skid control ECU and the seat belt control ECU is detected for approximately 3 seconds.
  • Skid control ECU
  • CAN communication system
  • Seat belt control ECU
  • Driving support ECU
U0123 When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU is detected for approximately 4 seconds.
  • Yaw rate sensor
  • CAN communication system
  • Driving support ECU
U0126 When the engine switch is on (IG), a communication error between the steering sensor and the driving support ECU is detected for approximately 5 seconds.
  • Steering angle sensor
  • CAN communication system
  • Driving support ECU
U0140 While engine switch is on (IG), communication stop between main body ECU and seat belt control ECU continues for 6 seconds or more.
  • Main body ECU
  • CAN communication system
  • Seat belt control ECU
U0151 While engine switch is on (IG), communication stop between air bag ECU and seat belt control ECU continues for 6 seconds or more.
  • Air bag ECU
  • CAN communication system
  • Seat belt control ECU
U0235 When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU is detected for approximately 2 seconds.
  • CAN communication system
  • Millimeter wave radar sensor
  • Driving support ECU
  • Wire harness or connector
U1002 When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU is detected for approximately 2 seconds.
  • CAN communication system
  • Millimeter wave radar sensor
  • Driving support ECU
  • Wire harness or connector
U1100 When the engine switch is on (IG), a communication error between the seat belt control ECU and the driving support ECU is detected for approximately 10 seconds.
  • Seat belt control ECU
  • CAN communication system
  • Driving support ECU
U1104
  • When the engine switch is on (IG), a communication error between the driving support ECU and the millimeter wave radar sensor is detected for approximately 1 second.
  • When the engine switch is on (IG), a communication error between the driving support ECU assembly and the seat belt control ECU is detected for approximately 1 second.
  • CAN communication system
  • Millimeter wave radar sensor
  • Driving support ECU
  • Wire harness or connector
  • Seat belt control ECU
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